Which extrusion is that Bob? The one I use is 8m+.
Frankly I don't see much point in limiting the mast height on a 14ft boat. It can really only be so high before it becomes a hindrance and if the beam isn't regulated, why should we regulate the mast height?
Having said that, I've spent a lot of time and money designing and building a very nice 14ft racing catamaran, the pictures of which I'm sure you've all seen, and I'd hate to see it relegated to the scrap heap in F14 because it has a mast height of 25'-10" or 7.57m so if you want to make the limit 26ft or 7.9m that'd be Ok with me.
I also think that max towing width in Australia would be a good and sensible max width for a 14ft cat. Having to build a tilt trailer to participate in F14 would make for an expansive, difficult and inequitable situation.
The maximum towing width in Australia is 2.5m (8ft 2.5inches)
Bern Leslie